The Page Manager can be used to perform different actions:
|Open the page manager via the menu on the top left|
|Select your target menu (here 'More') and click on 'Insert Child'.|
Select 'New Page', provide a label (here 'Test') and leave the content type to 'Text Content'
|Go back to your homepage|
|Find your new page in your menu|
|It is just drag and drop in the Page Manager!
You can turn your page into a top menu item or move it under another existing menu.